diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 7b8e108982b..9ecbe4a9ba9 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -6833,7 +6833,7 @@ write_auto_conf_file(int fd, const char *filename, ConfigVariable *head)
 
 	/* Emit file header containing warning comment */
 	appendStringInfoString(&buf, "# Do not edit this file manually!\n");
-	appendStringInfoString(&buf, "# It will be overwritten by ALTER SYSTEM command.\n");
+	appendStringInfoString(&buf, "# It will be overwritten by the ALTER SYSTEM command.\n");
 
 	errno = 0;
 	if (write(fd, buf.data, buf.len) != buf.len)